Chain saw grinder



May 6, 1958 B. l. wlLsoN ETAL 2,833,166

` CHAIN SAW GRINDER Filed Sept.l 5, 1956 y 2 Sheets-Sheet l INVENTORSBruce W//son W//fred A. S/'mdon May 6, 1958 l B. l. wlLsoN ETAL2,833,166

l CHAIN sAw GRINDER Filed Sept. 5. 1956 A 2 Sheets-Sheet 2 .gill j@INVENToRs 4 Bruce W/Yson Wilfred ALS/'mdon j vided therefor.

United States Patent O ice CHAIN SAW GRnsDER Bruce I. Wilson, FortAtkinson, and Wilfred A. Simdon,

Cambridge, Ws. I

Application September 5, 1956, Serial No. 608,107 7 Claims. (Cl. 76-41)This invention relates to chain saw grinders.

It is an object of the'present invention to provide a chain saw grinderwherein the chain is held in a vise which can be advanced a definiteamount into the path of the grinding wheel to remove stock and reserviceteeth uniform to each other,` the device sharpening the chain back tofactory tolerances without disassembling of the `chain teeth. v

Other objects of the invention are tov provide a chain saw grinderbearing the above objects inrnind which is of simple construction, has aminimum number of parts, is inexpensive to manufacture and efficient inoperation.

For other objects and forja better understanding of the invention,referencemay, be had to.the following detailed description taken linconnection with the accom-V panying drawing, in which: j

Figure l is aV front'elevational view of a preferred embodiment of thepresent invention;

Fig. 2 is a top plan view` thereof showing the grinding motor removed;

Fig. 3 is an end elevational view looking from the light of Fig. 1;V

Fig. 4 is a fragmentary vertical sectional view taken along the line 4 4of Fig. 1;

Fig. 5 is a vertical sectional view taken 5-5 of Fig. 2;

Fig. 6 is a vertical sectional view taken along the-line 6-6 of Fig. 2;and

Fig. 7 is a vertical sectional view taken along the line 7-7 of Fig. 2.AK

Referring nowmore in detail to the drawing, 10 indicates generally abody frame having a at rectangular lower portion 11 adapted to bemounted in a vise or the like, the upper portion being thickenedlaterally as at 12 and being provided with a vertically extending ways13 of substantially trapezoidal shape and including the gib 14 and thegib adjusting screws 15.

The upper end of the frame is integrally formed with the shelf 16 atright angles thereto, the ends of the shelf extending beyond thevertical edges o f the frame. It will be noted (Fig. l) that the ways 13extend upwardly to the upper surface of the shelf 16. y The shelf 16 isprovided with the way 17 of trapezoidal shape (-Fig. 6)

along the line .y

which extends from end to end,I the gib 17 being pro- A rectangularplate 18 is integrally formed at its lower end with the laterallyenlarged portion of trapezoidal shape 19 adaptedto slide/within the way17, the upper edge of the plate 18 having the rectangular cutout 20which defines the stationary jaw 21, Fig. 6. A movable jaw 22 ispositioned Within the cutout 20 and is adapted for cooperative movementwith the stationary jaw 21'by means of the lock screw 23 having thehandle portion 24. Dowels 25 align the moveable jaw 22 laterally withthe stationary jaw 21 while the springs 26 positioned within laterallyaligned cylindrical openings on the inner faces of the jaws 21 and 22 atopposite ends serve to make thevvise self-opening when the lock screw 23is released. s

As shown in Fig. 2, the jaw 21 at one end is integrally formed with thelaterally extending, internally threaded member 27l within which isscrewed the externally. tbreadf, ed portion 28 of ther feed mechanismindicated generally Y, at 29. s An- L-shaped bracket 30 is mounted onZthe undersurface of the shelf 16 at one end-thereof bymeans of thefastening means 31 and rotatably mounts the feed mechanism 29 againstlongitudinal displacement inter-j mediate the smooth cylindrical portion32 thereof and,

the collar 33. The'feed mechanism 29 also includes the enlarged,externally knurled operating knob 34 and upon rotationV of the same, yitwill Abe obvious that the-viserdesired amount ywithin, the, f

will move .longitudinally the way 17.

A supporting angle bracket '35 is integrally formedon its rearverticalface withthev trapezoidal shaped exten-I; sion slidablevertically within the way 13, thevertical position of the bracket beinglocked by the lock screwv 36 having the handle portion-37' (Fig; 3).

The vertical adjustment of the supporting ybracket35 is effected by thecam assembly indicated generallyat 37 and locked at the proper heightfor co-action by the lock screw 36, the cam assembly 37 including thecam lock' nut38 which allows` for' raising and lowering the cam.,

assembly 37 iu the frame 10 for making the grinderuniversal for allchains. i

The-bracket 35 rotatably mounts the semicircular end portion 39 of therectangular plate 40 of the compound slide indicated generally at 41 bymeans of the countersunk rivet V42, the upper surface of the plate 40outwardly of the rivet 42 being integrally formed withthe trapezoidalshaped extension 43. f 1

A carrier is provided and includes the base plate 44` formed on itsundersurface with the way 45 having the gib 46 and Within which isslidably positioned the extension 43, to permit the necessary movementof the carrier,

the plate 44 beingrintegrally formed at the center thereof with thevertical mounting plate 47 having a longitu-Y dinally extendingsubstantially semicircular opening 48. An electric motor grinderindicated generally at 49 is provided on its undersurface with thedepending vertical plate Sli-integrally formed with the semicirculardepending extension 51 which is pivotally mounted within thesemicircular opening 4S byv means vof vthe pin 52 and' adapted for freemovementtherewithin with one end 53 of the plate 50 resting on the uppersurface of the plate 47 (Fig. 7). The plate 50 above the end- 53 isprovided with the cutout- 54 which receives therewithin the externallyknurled head 55 of the tilt adjustment screw 56'.

(Fig. 7). The other end of the plate 50 is vertically spaced above theupper surface'of the plate `47 and isl provided with the `cylindricalbore 57 which receives therewithin the upper end of the coil spring 58,the lowerof this construction, the electric motor grinder 19V-may.

betilted for grinding.

In "operation, the frame 10 holds or supports all other members andallows for verticaland horizontal adjustments. The cooperating visejawst21 and 22`actuated 1by.the"sc`re`wx23 `will hold the chain 61rigid-fand will allow for the precise horizontal adjustment of the samecontrolled by the feed mechanism 29. The bracket 35 allows for thevertical adjustment of the compound slide 41 controlled by the camassembly 37 and locked Patented May 6, 195,8

the.

at the .proper height bythe 4loclt screw 36. The pivot 42 allows theproper angularadjustment which may be set at any number of degrees forthe proper cooperative action of*tli`e grinding'wheel t'o'tlie teethofrthe chain L61. TheV carrier 44, 47 allows the :grinding wheel to betraver'sed vback andfoth'through thetooth of the chain 61.

The above grinder has' been` in operation for field te'stinglandresearch work and hasbe'en tested for nearly a year and has `provedentirelyV satisfactory vin all respects. The tilt mechanism will permitthe Sharpening of the chains inl-planesother than they horizontal andrepresents adecided advantage.4 The device willy permit the 'jointingrand grinding `ofthe depth `gauges by grinding them The `ch`ainfg6lisplaced in the vise'withihe vcompound slide 41 set at vthe proper angl'eto 4the left or right depending jupon which'teethin lthe Achain we aregrinding, link vriv'et ofthe tooth weare grindingiis placed over thelock screw andthe Avice is locked. With the motor rtinning and Vinposition full -ahead to contact the tooth, the `tooth '-is advanced tothe grinding wheel until there is 'a Eslight grin'ding vspark and -thenadvanced 0.003 'or 0L0O5 more or one-eighth of a turn of the feed wheel34 with the grinding wheel out of the tooth and `the grinder V49 is run'back and forth by hand a few strokes and we are ready to `proceed tothe next tooth. If the chain has been handV le'd, and the angle *isofi', which is usuallythe case, itis necessary to repeat the 0.003 to0L005'in'ch advance once or twice more before moving to the next tooth.The aboveassurnes that the grinder, compound slide and supporthav'clbeen properly 'elevated with the elevating cam assembly 37 so asto initially position the stone or grinding wheel 61 above the level ofthe cutting tooth.

The above chain grinder has been designed in conformed withaslateral`enlargementof substantially trapezoidal shape adapted to move withinsaid way, and gib means at one side of said way.

2. A chain saw grinder according to claim 2, said means for adjustingthe position of said vise means comprising said plate at one end havinga lateral extension having an internally threaded bore, an L-shapedbracket secured to the end of said shelf, a feed mechanism including anexternally threaded shank screw threaded through said extension, saidfeed mechanism including a cylindrical portion abutting the outer faceof said bracket, a collar abutting the inner face of said bracket andsecured to said externally threaded portion and an enlarged manuallyoperable knob whereby upon rotation of said knob said vise means willmove longitudinally of said shelf to the desired position.

` 3. A chain saw grinder according to claim 2, said means for mountingsaidV support on said body frame` on the inner face thereof'being formedwith an extension sidering the Vfact that all hand lechains `have to beground considerably to get Ythem back to factory specifications, andthis grinding can be done with ease with the present-invention. i f

l While various 'changes may be made in the detail construction, itshall be understood that such4 changes shall be within the spirit andscope of the present invention as defined bythe appended claims.` Y -vWhat we claim `as new Vand desire to protect by Letters Patent of theUnited States is: a

1. A chain saw grinder comprising `a body frame,l a

of substantially trapezoidal cross section slidable within said Way,means for locking said support comprising lock screw means.

4. A chain saw grinder according to claim 3, said means foradjusting thevertical position of said support comprising cam assembly means, saidcam assembly means being adjustable within said body frame.

5. A chain saw grinder according to claim 4, said means for slidablymounting said'carrier on said plate comprising said plate on the uppersurface thereof being integrally formed with a longitudinally extendingtrapezoidal cross section, said carrier including a base plate having away on theundersurface thereof of trapezoidal cross section receivingsaid extension therewithin, gib means at one side of said way, saidcarrier including a vertical plate A.extending upwandly from said baseplate at right angles thereto.

l6. A chain saw grinder according to claim 5, said means for mountingsaid electric grinder Aon said carrier comprising said vertical platehaving an elongated opening horizontal shelf at fth'e upper end of saidframe, vise means y adapted to grip the chain therewithin, meansslidably mounting said vise means on said shelf, means for adjustingsaid vise means on said shelf, a support, means slidably mounting saidsupport upon said frame for vertical movement, means for adjusting theposition of said support, means for locking the support at the adjustedposition, an elongated plate pivotally mounted upon said suppo'rtandextending outwardly from said vise, a carrier, means `slidably mountingsaid carrier on said plate for longitudinal movement thereon, anelectric grinder, and means for mounting said electric grinder on saidcarrier for adjustment about a horizontal axis, said vise meanscomprising a vertical plate'having a cutout along the upper edge at oneside and defining a stationary jaw, removable jaw positioned within saidcutout and adapted for cooperative action with said stationary jaw,means for drawing said stationary and movable jaws together, springmeansrfor urging said jaws apart, dowel means for aligning saidstationary and movable jaws laterally with each other during movement,and said means for slidably mounting said vise means on said shelfcomprising said shelf having a trapezoidally shaped way extendingY fromend to end, said plate at the lower end being integrally ofsubstantially sernicircular shape, a depending plate secured `to thebottom of said electric grinder, said depending plate at the centerthereof being integrally formed with a depending sernicircular portionpivotally mounted within said sernicircular opening and adapted forrotational movement therewithin, one end of said depending p 'lateresting on the upper surface of said vertical carrier plate and having acutout portion thereabove, a tilt screw having an enlarged head withinsaid cutout and screw threaded downwardly through said plate andcarrier, the other end of said depending plate being vertically spacedfrom the upper surface of said vertical carrier plate, said dependingplate and 4carrier plate having vertically aligned openings, and a coilspring positioned within said vertically aligned openings. a

, 7. A chain saw grinder according to claim 6, including cooperatingindicia on said depending plate and carrier to indicate when the grinderis in a horizontal position,

and cooperating indicia carried by said support and the end of saidplate pivotally mounted thereon whereby to indicate the angulation ofthe grinder.

vReferences Cited in the file of this patent UNITED STATES PATENTS2,568,062 Fitch., i.-- Sept. 18, 1951 2,704,948 `Le 4Grand Mar. 29, 1955

